Answer:
The correct answer is:
O More people lived in urban centers than rural areas.
In 2008, for the first time in history, the world's urban population exceeded the rural population. According to the United Nations Population Fund, more than 50% of the global population was living in towns and cities in 2008, and this proportion was expected to increase to 70% by 2050.
The other options are incorrect:
The iPad was first released in 2010, so it could not have been purchased more than visits to U.S. national parks in 2008.
The global shift from predominantly rural to urban living occurred gradually over time, not specifically in 2008.
There is no record of 2008 being a particularly significant year for the number of people planting gardens.